Durin the 19t century, Sheffield gained an internaitional reputation for steel production. Mony innovations wur developed locally, includin crucible an stainless steel, fuellin an amaist tenfold increase in the population durin the Industrial Revolution. Sheffield received its municipal charter in 1893, offeecially becomin the City of Sheffield. Internaitional competition in iron an steel caused a decline in traditional local industries durin the 1970s an 1980s, coincidin wi the collapse o coal minin in the aurie.